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Yukina is an ice maiden and sister to Hiei. Yukina is born to Hina, a twin to Hiei. When she finds out about her brother who was cast from the Ice Kingdom she escapes to the human world where she is captured by Gonzo Tarukane, a member of the Black Black Club. Tarukane keeps Yukina captive, torturing her to acquire the precious crystals created by her tears. Eventually she hardens her heart so as to prevent herself from crying even under extreme torture, prompting Tarukane to hire the Toguro brothers to aid him. Yusuke and Kuwabara, unknowingly shadowed by Hiei, succeed in rescuing Yukina from Tarukane, allowing her to continue her search for her lost brother.

Source from Wikipeida